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Physics Midterm Rev.
| Question | Answer |
|---|---|
| Mass, along with what other two quantities, make up the three basic quantities in the International System used by physicists to derive additional quantities? | Length and time. |
| Two objects of different masses are released simultaneously from the top of a 20 m tall tower and fall to the ground. If the air resistance is ignored, then when will they hit the ground? | At the same time. |
| A baseball catcher throws a ball vertically upward and catches it in the same spot when it returns to his mitt. At what point in the ball’s path does it experience zero velocity and non-zero acceleration at the same time? | At the top of its trajectory. |
| The value of an object’s acceleration may by characterized in equivalent words by which of the following? a. Displacement. b. Rate of change of displacement. c. Velocity. d. Rate of change of velocity. | D. Rate of Change of Velocity. |
| A rock is thrown upward in the air. What statement, relating to the velocity and acceleration, describes the condition of the rock at the highest point of its trajectory? | Velocity is zero, acceleration is not zero. |
| If the kinetic energy of an object is quadrupled, its momentum will change by what factor? | Two. |
| If the momentum of an object is tripled, its kinetic energy will change by what factor? | Nine. |
| The dimensional equation of the quantity momentum is: | [ML/T] |
| The impulse experienced by a body is equivalent to its change in which of the following quantities? | Momentum. |
| In a two-body collision, if the kinetic energy of the system is conserved, then what statement best describes the momentum after the collision? | Must also be conserved |
| In a two-body collision, if the momentum of the system is conserved, then what statement best describes the kinetic energy after the collision? | May also be controlled. |
| A billiard ball collides in an elastic head-on collision with a second identical ball. What is the kinetic energy of the system after the collision compared to that before collision? | The same as before. |
| A billiard ball collides in an elastic head-on collision with a second stationary identical ball. After the collision, what condition applies to the first ball regarding it's velocity? | Comes to complete rest. |
| The dimensional equation for the quantity impulse is: | [ML/T] |
| A valid unit for momentum is: | (kg)(m/s²) |
| The dimensional equation for kinetic energy is: | [ML²/T²] |
| If during a given physical process the only force acting on an object is friction, what must be assumed in regard to the object’s kinetic energy? | Decrease. |
| The rate at which work is done is equivalent to which of the following? | Power. |
| How is the quantity of work (equal to one joule) equivalent to Watts? | Watts x Seconds. |
| A 3-lb block is placed on top of a 5-lb block that is in a stable position on a table. What is the magnitude of the force exerted by the table on the 5-lb block? | 8 lbs. |
| As a car goes up a hill, there is a force of friction between the road and the tires rolling on the road. The maximum force of friction is equal to... | The weight of the car times the coefficient of kinetic friction |
| A body on earth has inertia, mass, and weight. Which of these properties change(s) when the body is taken to another planet? | Only weight. |
| The dimensional equation for force is... | [ML/T²]. |
| Unit of force in International System is... | Newton. |
| If we know an object is moving at a constant velocity, what must we assume regarding the object’s net force? | There is no net force acting on the object. |
Created by:
OliviaRoark
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